Move apps to SD card?

What are the steps for moving apps to your sd card to save space? Are there some apps that you cants or should not move to your sd card? I get the message every now and then that my droid is low on space, and thought this might help.

Are there some apps that you cants or should not move to your sd card?

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You shouldn't move any widgets or anything that you want to use while you have the card mounted to your PC. I wouldn't move anything that's needed immediately on startup either as the SD card is not immediately available.